Eligible postsecondary school. An eligible postsecondary school is generally any accredited public, nonprofit, or proprietary (privately owned profit-making) college, university, vocational school, or other postsecondary educational institution. Also, the institution must be eligible to participate in a student aid program administered by the U.S. Department of Education. Virtually all accredited postsecondary institutions meet this definition.
https://www.irs.gov/pub/irs-pdf/p970.pdf